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Largely Enhanced Seebeck Coefficient and Thermoelectric Performance by the Distortion of Electronic Density of States in Ge2Sb2Te5
Hu, Ping; Wei, Tian-Ran; Qiu, Pengfei; Cao, Yan; Yang, Jiong; Shi, Xun; Chen, Lidong
2019-09-18
Source PublicationACS APPLIED MATERIALS & INTERFACES
ISSN1944-8244
Volume11Issue:37Pages:34046
SubtypeArticle
AbstractAs one of the state-of-the-art phase-change materials, the stable Ge2Sb2Te5 hexagonal compound also exhibits decent thermoelectric performance with high electrical conductivity and low thermal conductivity. Nonetheless, the excessively high carrier concentration and low Seebeck coefficient are the bottlenecks to achieve high zT values. In this work, with the intention to optimize the electrical properties, indium was introduced as a potentially donor-like dopant in a series of Ge2-xInxSb2Te5 samples. The substitution of indium for germanium lowers the density of hole carriers and enhances the Seebeck coefficient. Noticeably, the room-temperature Seebeck coefficient of the doped samples can be three times as large as that of the pristine one, which obviously departures from the theoretically predicted Pisarenko relation based on the single parabolic band model. By virtue of DFT calculations and modeling, the remarkable enhancement of Seebeck coefficient was attributed to the doping-induced local distortion in the electronic density of states. Further insight reveals that indium doping amplifies the bonding character of Ge-Te adjacent to indium and enhances the atomic interaction along the c-axis. Due to the optimized electrical properties as well as the suppressed thermal conductivity, a maximal zT value of 0.78 was achieved in Ge1.85In0.15Sb2Te5 at 700 K, which is about 40% higher than that of the pristine sample.
Keywordthermoelectric Ge2Sb2Te5 electronic density of states resonant level bonding character
DOI10.1021/acsami.9b12854
Language英语
WOS Research AreaScience & Technology - Other Topics ; Materials Science
PublisherAMER CHEMICAL SOC
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/26830
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Hu, Ping,Wei, Tian-Ran,Qiu, Pengfei,et al. Largely Enhanced Seebeck Coefficient and Thermoelectric Performance by the Distortion of Electronic Density of States in Ge2Sb2Te5[J]. ACS APPLIED MATERIALS & INTERFACES,2019,11(37):34046.
APA Hu, Ping.,Wei, Tian-Ran.,Qiu, Pengfei.,Cao, Yan.,Yang, Jiong.,...&Chen, Lidong.(2019).Largely Enhanced Seebeck Coefficient and Thermoelectric Performance by the Distortion of Electronic Density of States in Ge2Sb2Te5.ACS APPLIED MATERIALS & INTERFACES,11(37),34046.
MLA Hu, Ping,et al."Largely Enhanced Seebeck Coefficient and Thermoelectric Performance by the Distortion of Electronic Density of States in Ge2Sb2Te5".ACS APPLIED MATERIALS & INTERFACES 11.37(2019):34046.
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